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ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction. sorbent configurations – stacked phases. Sorbent Configurations to Enhance Selectivity. Stacked phases Layered phases Mixed phases. Role of Stacking Phases. Extending the range Enhancing the selectivity Method development

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environmental analysis i solid phase extraction

ENVIRONMENTALANALYSISI. Solid Phase Extraction

sorbent configurations –

stacked phases

sorbent configurations to enhance selectivity
Sorbent Configurations to Enhance Selectivity
  • Stacked phases
  • Layered phases
  • Mixed phases
role of stacking phases
Role of Stacking Phases
  • Extending the range
  • Enhancing the selectivity
  • Method development
  • Multiple detection protocol
stacked columns

CBA

Stacked Columns

Bases, Acids

and Neutrals

HPLC Compatible

Solvent

GC Compatible

Solvent

Bases Retained

(Paraquat, Diquat)

CBA

Analyte

ENV+

Acids and Neutrals

Retained

ENV+

Bases for

HPLC Analysis

Acids and Neutrals for

GC Analysis

oc pesticides on c18 ec

alpha - BHC

beta - BHC

gamma - BHC

delta - BHC

heptachlor

aldrin

heptachlor epoxide

endosulfan I

4,4" DDE

dieldrin

endrin

4,4" DDD

endosulfan II

endrin aldehyde

4,4" DDT

endosulfan sulfate

methoxychlor

AVG:

94

90

92

99

91

73

89

90

62

89

86

91

78

95

100

88

99

88

OC Pesticides on C18(EC)
oc pesticides stacked phases
OC Pesticides, Stacked Phases

C18 (EC) C2 C18 (EC) SUM

alpha - BHC 0 101 101

beta - BHC 0 101 101

gamma - BHC 0 100 100

delta - BHC 0 97 97

heptachlor 85 7 92

aldrin 85 0 85

heptachlor epoxide 57 47 104

endosulfan I 65 42 107

4,4" DDE 86 5 91

dieldrin 80 21 101

endrin 67 34 101

4,4" DDD 90 6 96

endosulfan II 65 37 102

endrin aldehyde 11 84 95

4,4" DDT 85 0 85

endosulfan sulfate 29 57 86

methoxychlor 112 0 112

AVG: 54 43 97

94

90

92

99

91

73

89

90

62

89

86

91

78

95

100

88

99

88

Vs